GMAT DS Question

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I recently started my preparations and seem to be struggling a lot in Data sufficiency questions, particularly those on numbers. It would be great if any one could recommend a good source for working on problems such as this one. Question: ...
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I recently started my preparations and seem to be struggling a lot in Data sufficiency questions, particularly those on numbers. It would be great if any one could recommend a good source for working on problems such as this one.


Question:
p and q are positive integers. What is the highest prime factor of the product of p and q?


(1) The GCD of p and q is 5

(2) The LCM of p and q is 105


Can some one provide a detailed explanation. I have obtained an answer but its incorrect.



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